Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Solving Problems the Swift Way
Search
Ash Furrow
July 05, 2014
Technology
23
8.6k
Solving Problems the Swift Way
A presentation on solving problems in idiomatic Swift.
Ash Furrow
July 05, 2014
Tweet
Share
More Decks by Ash Furrow
See All by Ash Furrow
Migrating to React Native: A Long-Term Retrospective
ashfurrow
0
220
How Artsy Automates Team Culture
ashfurrow
0
3.1k
Building Custom TSLint Rules
ashfurrow
0
410
Circumventing Fear of the Unknown
ashfurrow
1
510
Building Better Software by Building Better Teams
ashfurrow
1
550
Building Open Source Communities
ashfurrow
0
840
Comparative Asynchronous Programming
ashfurrow
2
9.4k
Building Compassionate Software
ashfurrow
0
420
Swift, Briskly
ashfurrow
0
130
Other Decks in Technology
See All in Technology
モニタリング統一への道のり - 分散モニタリングツール統合のためのオブザーバビリティプロジェクト
niftycorp
PRO
1
520
本当にわかりやすいAIエージェント入門
segavvy
1
300
「現場で活躍するAIエージェント」を実現するチームと開発プロセス
tkikuchi1002
3
300
「Chatwork」のEKS環境を支えるhelmfileを使用したマニフェスト管理術
hanayo04
1
400
american aa airlines®️ USA Contact Numbers: Complete 2025 Support Guide
aaguide
0
500
Transformerを用いたアイテム間の 相互影響を考慮したレコメンドリスト生成
recruitengineers
PRO
2
430
ClaudeCodeにキレない技術
gtnao
1
860
Maintainer Meetupで「生の声」を聞く ~講演だけじゃないKubeCon
logica0419
0
110
Deep Security Conference 2025:生成AI時代のセキュリティ監視 /dsc2025-genai-secmon
mizutani
4
2.8k
安定した基盤システムのためのライブラリ選定
kakehashi
PRO
3
130
ClaudeCode_vs_GeminiCLI_Terraformで比較してみた
tkikuchi
1
940
[SRE NEXT] ARR150億円_エンジニア140名_27チーム_17プロダクトから始めるSLO.pdf
satos
5
3k
Featured
See All Featured
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
2.9k
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.7k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
How to train your dragon (web standard)
notwaldorf
96
6.1k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
Why Our Code Smells
bkeepers
PRO
337
57k
Scaling GitHub
holman
460
140k
Designing Experiences People Love
moore
142
24k
Rebuilding a faster, lazier Slack
samanthasiow
83
9.1k
Become a Pro
speakerdeck
PRO
29
5.4k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
340
Transcript
Idiomatic Swift Ash Furrow @ashfurrow
None
1.Better ways to solve familiar problems using Swift 2.Everyone is
a beginner again 3.We should share what we learn
Problem-Solving
You are here You wanna be here “Problem Solving”
• It would be a shame not to take advantage
of these new tools and techniques • Let’s take a look at some examples
• Completely new concept of nil • Indicates “missing” value
• Replaces nil, Nil, NULL, CGRectNull, -1, NSNotFound, NSNull, etc • Haskell’s “Maybe” type • C#’s “Nullable Types” Optionals
• Works well with Swift’s compile-time type safety • Which
is awesome • No, seriously, awesome • Eliminates several classes of bugs • Don’t over-use optional types Optionals
let a = someFunction() //returns Int? if a != nil
{ // use a! } Optionals
let a = someFunction() //returns Int? if let b =
a { // do something with b } if let a = a { // do something with a } Optionals
• Tuples are compound values • They are lightweight, temporary
containers for multiple values • Those values can be named • Useful for functions with multiple return types Tuples
func calculate() -> (Bool, Int?) { // ... return (result,
errorCode) } Tuples
func calculate() -> (Bool, Int?) { // ... return (result,
errorCode) } ! let calculation = calculate() ! if (calculation.0) { // … } Tuples
func calculate() -> (Bool, Int?) { // ... return (result,
errorCode) } ! let calculation = calculate() let (result, _) = calculation ! if (result) { // … } Tuples
func calculate() -> (result: Bool, errorCode: Int?) { // ...
return (result: result, errorCode: errorCode) } ! let calculation = calculate() if (calculation.errorCode) { // ... } Tuples
for (key, value) in dictionary { // ... } Tuples
• New APIs shouldn’t use out parameters • eg: NSError
pointers • Really great for use in pattern-matching Tuples
• Borrowed from functional programming • Really useful in tail-recursive
functions • Like “switch” statements on steroids Pattern-Matching
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath { switch (indexPath.section) { case
0: { switch (indexPath.row) { case 0: ... } } break; } } Pattern-Matching
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath { switch (indexPath.section) { case
ASHLoginSection: { switch (indexPath.row) { case ASHLoginSectionUserNameRow: ... } } break; } } Pattern-Matching
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) { switch (indexPath.section,
indexPath.row) { case (0, _): ... default: ... } } Pattern-Matching
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) { switch (indexPath.section,
indexPath.row) { case (0, let row): ... default: ... } } Pattern-Matching
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) { switch (indexPath.section,
indexPath.row) { case (0, let row) where row > 5: ... default: ... } } Pattern-Matching
struct IntList { var head: Int = 0 var tail:
IntList? } ! ... ! switch (list.head, list.tail) { case (let head, nil): //... case (let head, let tail): //... } Pattern-Matching
• Generics are common in other languages, like C# and
C++ • Using a generic type as a placeholder, we can infer the type of variables at compile- time • A part of Swift’s “safe by default” behaviour Generics
struct Stack<T> { var items = [T]() mutating func push(item:
T) { items.append(item) } mutating func pop() -> T { return items.removeLast() } } Generics
var stack = Stack<Int>() ! var stack = Stack<String>() !
var stack = Stack<Recipe>() Generics
struct Stack<T: Equatable> : Equatable { var items = [T]()
mutating func push(item: T) { items.append(item) } mutating func pop() -> T { return items.removeLast() } } ! func ==<T>(lhs: Stack<T>, rhs: Stack<T>) -> Bool { return lhs.items == rhs.items } Generics
• Use stacks whenever you want to define an abstract
data type structure • Whenever possible, don’t bind new data structures to existing ones • Use protocols for loose coupling Generics
• Optionals • Pattern-matching • Tuples • Generics
Everyone is a Beginner
• No one is an expert in Swift • This
can be kind of stressful • Relax Everyone is a Beginner
• The benefits outweighs the cost of learning • Depending
on your circumstance • Have your say Everyone is a Beginner
• The hardest thing is the most important thing •
Start Everyone is a Beginner
• Don’t be embarrassed to ask questions! • Try to
ask in public so others can benefit from the answer Everyone is a Beginner
• Let’s borrow ideas Everyone is a Beginner
• Community-based conventions and guidelines are still being established Everyone
is a Beginner
We Should Share What We Learn
• Conventions and guidelines are still in flux • There’s
an opportunity to significantly alter the future of iOS and OS X programming We Should Share What We Learn
• The demand for material on Swift is HUGE •
Great opportunity to get known We Should Share What We Learn
• When you teach, you learn We Should Share What
We Learn
• If we all share what we learn, we all
get smarter • Rising tides lift all boats We Should Share What We Learn
• Stack Overflow • Blogs • Tweets • Gists •
Open source • Radars We Should Share What We Learn
http://github.com/artsy/eidolon
1.Better ways to solve familiar problems using Swift 2.Everyone is
a beginner again 3.We should share what we learn
Let’s Make Better Mistakes Tomorrow
Thank you" @ashfurrow